Maruina (Aculcina) pila, Camico & Cordeiro & Chagas, 2019

Camico, Jéssica Luna, Cordeiro, Danilo Pacheco & Chagas, Cínthia, 2019, Maruina Müller, 1895 (Diptera: Psychodidae): description of four new species from Brazil, with revised diagnoses for the genus and subgenera, Zootaxa 4652 (2), pp. 296-316 : 302

Maruina (Aculcina) pila sp. nov.

( Figs. 15–22 )

Diagnosis. Combination of the following characters: strong interocular crevice; pedicel elongated, about 3X the length of subspherical scape; wing vein R 4 reaching wing margin much closer to R 5 than to R 3; abdominal sternites 5–8 with very thin cross sclerotized chitinous bands.

Description. Male. Head ( Figs. 15 and 16 ): vertex pilose, divided at base by a deep interocular crevice; distance between eyes equivalent to 4 facet diameters, eye bridge with three facet rows; frons with a small group of setae at base; antenna with scape subspherical, pedicel subcylindrical, around 3X the length of scape ( Fig. 17 ) and 13 flagellomeres, short digitiform ascoids present on flagellomeres 2–11; palpus formula: 1.0:1.1:1.3:2.0 ( Fig. 18 ). Wing ( Fig. 19 ): length 1,44 mm, maximum width 0,384 mm; anterior margin of C continuous from level of base of Sc; R 2+3, R 4, R 5, M 1, M 3, M 4 and CuA free at base of wing; R 2 united to R 3; R 4 reaching wing margin much closer to R 5 than to R 3; R 5 ending at wing apex, M 2 separated from M 3. Abdomen: sternites 5–8 with very thin cross sclerotized chitinous bands. Terminalia ( Figs. 20–22 ): gonocoxite with approximately 16 setae on dorso-lateral surface, gonostylus subtriangular, shorter than gonocoxite; aedeagal sheath sclerotized apically, forming a coniform guide to aedeagus; aedeagus with many longitudinal short and thin spines; ejaculatory apodeme longer than aedeagal sheath; epandrium with concave apical margin; subepandrial sclerite Y-shaped, posterior arms little longer than anterior arm, apex of posterior arms expanded; epandrial appendage long and narrow, with an apical clavate tenaculum; epiproct with convex posterior margin, not projecting caudally; hypoproct wider than long with convex posterior margin.

Female. Unknown

Material examined. Holotype: ♂ BRAZIL, Rio Grande do Sul, Santa Cruz, Monte Alverne , 23º 33’48.58’’s 52º20’17.16’’w, 18–20.i.2015, malaise, col. P. Barcelos-Silva ( INPA).

Etymology. From the Latin pila , meaning “column”, in reference to the remarkable long and cylindrical pedicel on the antenna.

Distribution. Brazil (Rio Grande do Sul).

Holotype condition. Slide mounted, dissected, head, thorax and abdomen under one cover slip, both wing un- der another cover slip, left antenna complete, right antenna broken on 5 th flagellomere, both palpi complete, terminalia dissected, aedeagal complex together with right gonopods, epandrium and surtyli together with left gonopods.

Remarks. This species has striking modifications in the head: vertex with interocular crevice, pedicel elongated; however, it still shows all diagnostic features of Maruina (Aculcina) . The wing venation of M. (A.) pila and M. (A.) duckhousei are similar, mainly on the position of R 4, which on other species of Maruina is midway between R 3 and R 5 or is even closer to R 3. These two species also share the pattern of aedeagal spines, shape of epandrial appendage and shape of subepandiral sclerite but they can be easily differentiated by the relative length of pedicel and by the presence of a deep interocular crevice in M. (A.) pila .

Figures

FIGURE 15–22. Maruina (Aculcina) pila. 15. Head, frontal view.16. Detail of frons, eyes and vertex, frontal view. 17. Scape and pedicel. 18. Palpus. 19. Wing. 20–22. Male terminalia. 20. Aedeagal complex, dorsal view. 21. Aedeagal complex, lateral view. 22. Gonopods, epandrium and epandrial appendage, lateral view. Abbreviations. ash=aedeagal sheath; asp=aedeagal spines; eap=epandrial appendage; eja=ejaculatory apodeme; ep=epandrium; gpd=gonocoxal apodeme; gt=gonostylus; gx=gocoxite; ped=pedicel; scp=scape; ten=tenaculum.